Convenient NYS launches include Westport which is approx. 10 min from exit 31 I87, Port Douglas which is approx. 15 min from exit 33 I87, and Peru Dock which is approx. 15 min from exit 35 I87.
Personally Bob I think Westport would be your best bet. At the end of the run you and the Lake George crew could put a little gas, if necessary, (premium at breakwaters) in your rigs when the run ends in Burlington then make the straight shot to Westport. Round trip from Westport to the Peru Launch you'll probably save about an hour and 15 minutes of trailering.